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Home › Subaru › 2016 › BRZ Series.HyperBlue › Repair and Diagnosis › Body & Frame › Door Locks › Key Warning System › Key Warning System › Key Reminder Buzzer Does Not Sound › Inspection steps

Inspection steps

NOTE: Because the key warning system includes functions that use CAN communication, first check if any problem is present in the CAN communication function according to "How to troubleshoot". Next, perform the following troubleshooting procedure.
  1. Reading values with SSM3 (front door courtesy light switch)
    1. Connect the SSM3 to the DLC3.
    2. Turn IG SW to ON.
    3. Turn on the SSM3.
    4. Enter the following menus. [Integ. unit mode] →[Current Data Display & Save]
    5. Using SSM3, read the data list according to the screen displays.

      Main body

      MAIN BODY ITEM DESCRIPTION

      Item Name Description/display range Normal value Remarks
      [D Door Courtesy] Driver's door courtesy light switch signal/ON or OFF ON: Driver's door is open
      OFF: Driver's door is closed      		 -

      Criteria: When the unlock warning switch is operated, the display is changed as indicated in the table

      NG: To Lighting system (Door courtesy light switch circuit) (Refer to DOOR COURTESY LIGHT CIRCUIT )

      OK: Go to next step

  2. Reading values with SSM3 (key unlock warning switch)
    1. Connect the SSM3 to the DLC3.
    2. Turn IG SW to ON.
    3. Turn on the SSM3.
    4. Enter the following menus. [Integ. unit mode] →[Current Data Display & Save]
    5. Using SSM3, read the data list according to the screen displays.

      Main body

      MAIN BODY ITEM DESCRIPTION

      Item Name Description/display range Normal value Remarks
      [Key Unlock Warning SW] Unlock warning switch signal/OFF or ON OFF: Ignition key is not inserted
      ON: Ignition key is inserted      		 -

      Criteria: When the unlock warning switch is operated, the display is changed as indicated in the table.

      NG: Go to Step  4.

      OK: Go to next step

  3. Inspecting combination meter ASSY (buzzer operation)
    1. Remove the key from the key cylinder, turn the light control switch for headlight dimmer switch ASSY to the tail position, and open the driver's door.

      Criteria: The light warning buzzer sounds

      NOTE: The key warning system sounds the buzzer integrated in the combination meter and activates the lockout prevention function. This buzzer is also used for the light warning system. Therefore, check that the combination meter buzzer operates to alert the user to the light left illuminated.

      NG: Replace the combination meter ASSY

      OK: Replacement of the main body ECM (multiplex network body ECM)

  4. Inspecting unlock warning switch ASSY
    1. Remove the unlock warning switch ASSY. (Refer to UNLOCK WARNING SWITCH ASSY )
    2. Inspect the unlock warning switch ASSY. (Refer to UNIT INSPECTION )

      NG: Replace the unlock warning switch ASSY (Refer to UNLOCK WARNING SWITCH ASSY )

      OK: Go to next step

  5. Inspecting wiring harness and connector (main body ECM - unlock warning switch)
    1. Disconnect the unlock warning switch ASSY connector D53.
    2. Disconnect the main body ECM (multiplex network body ECM) connector D5.
    3. Measure the voltage and resistance according to the following table.

      Voltage

      VOLTAGE REFERENCE

      Inspection terminals Inspection conditions Standard value
      D53-1 - Chassis ground Always 11 to 14V

      Resistance

      RESISTANCE REFERENCE

      Inspection terminals Inspection conditions Standard value
      D53-2 - D5-22 Always 1 Ωor less
      D53-2 - Chassis ground Always 10 kΩ or more
      Fig 1: Identifying Unlock Warning Switch Assy Connector Terminals
      G10216155Courtesy of SUBARU OF AMERICA, INC.

      NG: Repair or replacement of wiring harness or connector

      OK: Replacement of the main body ECM (multiplex network body ECM)

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